import http from "http";
import { SERVER_PORT } from "./app/app.config";
import app from "./app";

const port = normalizePort(SERVER_PORT || "8080");
app.set("port", port);

const server = http.createServer(app);
server.listen(port);
server.on("error", onError);
server.on("listening", onListening);

/**
 * Normalize a port into a number, string, or false.
 */
function normalizePort(val) {
  const port = parseInt(val, 10);
  if (isNaN(port)) return val;
  if (port >= 0) return port;
  return false;
}

/**
 * Event listener for HTTP server "error" event.
 */
function onError(error) {
  if (error.syscall !== "listen") {
    throw error;
  }

  var bind = typeof port === "string" ? "Pipe " + port : "Port " + port;

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case "EACCES":
      console.error(bind + " requires elevated privileges");
      process.exit(1);
      break;
    case "EADDRINUSE":
      console.error(bind + " is already in use");
      process.exit(1);
      break;
    default:
      throw error;
  }
}

/**
 * Event listener for HTTP server "listening" event.
 */
function onListening() {
  var addr = server.address();
  console.log(`>>> http://${addr.address}:${addr.port}`);
}
